In the ever-evolving world of Composable Commerce, adaptability and innovation are key. Understanding API Gateway Deployment Patterns is crucial for retail businesses seeking agility and flexibility in e-commerce. 

Join us as we explore API Gateway Deployment Patterns, providing you with insights to improve your Composable Commerce strategy. 

Significance of API Gateway in Composable Commerce 

An API gateway is a server that acts as the main entry point for all requests in a microservices-based application. It directs requests to the correct microservices, manages authentication and authorization, and offers features like load balancing, caching, and monitoring. As all data must pass through the gateway before being routed, it ensures security for the microservices and prevents unnecessary exposure. 

An API gateway helps address various challenges in microservices architecture, which is increasingly popular for large, cloud-hosted applications, including Composable Commerce. Since Composable Commerce relies on MACH principles (Microservices, API First, Cloud Native, Headless), the API gateway plays a pivotal role. 

Read also: Business and Technical Benefits of Composable Commerce

The Role of API Gateway in Composable Commerce 

An API Gateway plays a vital role in a microservices-based Composable Commerce setup by handling these key responsibilities: 

  • API Security: Controls access, ensuring only authenticated users can reach the backend APIs, safeguarding the enterprise’s operations. 
  • API Monitoring and Logging: Tracks API requests, response times, and SLAs, providing unified logging for all Packaged Business Capabilities (PBCs) involved. 
  • Rate-Limiting: Sets limits on the number of API calls a client can make per second, managing network traffic effectively. 
  • API Scalability: Handles spikes and increases API traffic, adapting to changing loads seamlessly. 
  • API Caching: Caches frequently request data to reduce the load on primary databases, improving performance. 
  • API Routing: Routes requests to the appropriate backend services, sometimes combining results from multiple services. 
  • API Transformation: Converts request and response formats, aiding the transition from SOAP-based to REST-based APIs and speeding up deployment. 

What are External and Internal APIs? 

All APIs fall into two categories: Internal and External

External APIs allow developers to integrate their applications with third-party services, such as public cloud services or SaaS applications. Businesses use these APIs to provide a secure and standardized interface for the public to access their data and build applications. 

Internal APIs are used within a company’s internal network or cloud to access sensitive systems and data not exposed to the public. These APIs are highly specific and not intended for general use. 

To manage these APIs effectively, it’s best practice to use dedicated API Gateways for each type. A dedicated API Gateway for internal APIs offers several advantages: 

  • Limits network access to sensitive APIs not meant for public use. 
  • Segments internal traffic from partner and user apps, reducing the impact of internal API consumption. 
  • Supports a gradual migration path for legacy APIs not currently protected by an API Gateway. 

Read also: Building Tomorrow’s eCommerce: From Monoliths to Composable Commerce

API Gateway Deployment Patterns in Composable Commerce 

Several deployment patterns can enhance the management of services in a Composable Commerce architecture by using multiple API gateways and optimizing the functionality of Packaged Business Capabilities (PBCs). Here are some key patterns: 

A centralized edge gateway is an API gateway design where all incoming requests go through a single gateway at the system’s edge, routing them to the appropriate PBC. This gateway is the main entry point, providing functions like request routing, load balancing, caching, and authentication. 

This pattern is ideal if: 

  • The eCommerce architecture is simple 
  • PBCs are limited and straightforward 
  • It’s for startups or small-medium businesses 
  • There are few channels or clients 
  • Business logic is not complex 
  • Integrations are minimal and simple 
  • The same API configurations apply to all PBCs 

A two-tier gateway design uses a client-facing gateway at the system’s edge that routes requests to a second gateway, directing them to the appropriate PBC or backend service. This pattern enhances security and scalability by separating the client-facing and backend gateways. 

This pattern is ideal if: 

  • You are a large organization or enterprise 
  • Your eCommerce architecture is complex 
  • You have many complicated PBCs 
  • PBCs need grouping based on business requirements 
  • Each PBC group requires different gateway configurations 
  • Separate implementations are needed for each department or business line 

The microgateway pattern uses dedicated API gateways for internal communication between PBCs or microservices. Each PBC or microservice has its own gateway with specific policies, security rules, monitoring, and metrics aggregation. 

This pattern is ideal if: 

  • There are complex integrations between PBCs 
  • Each PBC needs different gateway configurations 
  • Monitoring and metrics need aggregation from multiple microservices 
  • There are many complicated PBCs 

The sidecar pattern involves attaching an API gateway as a container to each microservice, typically within a Kubernetes environment. This setup enables every service to configure its gateway as per its requirements. 

This pattern is ideal if: 

  • Integrations between PBCs are very complex 
  • PBCs have large and highly complicated microservices 
  • Microservices have multiple, complex integrations with other systems 
  • Each microservice needs monitoring, logging, configuration, and networking services 

Why Use Multiple API Gateways in Composable Commerce? 

Multiple API Gateways offer numerous advantages in Composable Commerce: 

  • Enhanced Security: Segregates external and internal APIs, reducing exposure risks. 
  • Dedicated API Usage Monitoring: Provides detailed insights into API usage trends and performance.
  • Better Governance: Allows tailored configurations across PBCs, improving efficiency and scalability. 

Read also: MACH architecture (backbone of composable commerce)


In the dynamic world of Composable Commerce, understanding API Gateway Deployment Patterns is crucial. API Gateways enhance security, enable dedicated API usage monitoring, and ensure better governance in your digital commerce strategies. By embracing these patterns and harnessing the power of API Gateways, you can position your business for success in the ever-changing digital marketplace. 

Now is the time to explore how implementing these strategies can elevate your business to new heights.